[FIX] website_slides: Fix displayed rewards on quiz

This commit fixes the amount of point gained in a quiz.
The amount of point displayed on the quiz was the number you
would gain on the next attempt instead of the actual amount you gained
when passing it. This was due to the usage of the wrong variable.

Task: #1947884
PR: #32083

addons/website_slides/static/src/xml/slide_quiz.xml

@@ -60,7 +60,7 @@
                 <b t-else="" class="my-0 h5">Done !</b>
                 <span class="my-0 h5" style="line-height: 1">
                     <span role="button" title="Succeed and gain karma" aria-label="Succeed and gain karma" class="badge badge-pill badge-warning text-white font-weight-bold ml-3 px-2">
-                        + <t t-esc="widget.quiz.quizKarmaGain"/> XP
+                        + <t t-if="! widget.slide.completed" t-esc="widget.quiz.quizKarmaGain"/><t t-else="" t-esc="widget.quiz.quizKarmaWon"/> XP
                     </span>
                 </span>
             </div>